/*
 * Copyright 2010 Christian Schindelhauer, Peter Thiemann, Faisal Aslam, Luminous Fennell and Gidon Ernst.
 * All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This code is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3
 * only, as published by the Free Software Foundation.
 * 
 * This code is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License version 3 for more details (a copy is
 * included in the LICENSE file that accompanied this code).
 * 
 * You should have received a copy of the GNU General Public License
 * version 3 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 * 
 * Please contact Faisal Aslam 
 * (aslam AT informatik.uni-freibug.de or studentresearcher AT gmail.com)
 * if you need additional information or have any questions.
 */
package takatuka.optimizer.VSS.logic.preCodeTravers;

import takatuka.classreader.dataObjs.attribute.*;
import takatuka.classreader.logic.factory.*;
import takatuka.classreader.logic.util.Miscellaneous;
import takatuka.optimizer.VSS.logic.preCodeTravers.ReduceTheSizeOfLocalVariables;

/**
 *
 * Description:
 * <p>
 *
 *
 * </p>
 * @author Faisal Aslam
 * @version 1.0
 */
public class ChangeMaxStackSize {

    private static final ChangeMaxStackSize myObj = new ChangeMaxStackSize();
    private static final FactoryFacade factory = FactoryPlaceholder.getInstanceOf().getFactory();

    /**
     * the constructor is private
     */
    private ChangeMaxStackSize() {
    }

    /**
     *
     * @return
     */
    public static ChangeMaxStackSize getInstanceOf() {
        return myObj;
    }

    /**
     * 
     * @param codeAtt
     */
    public void execute(CodeAtt codeAtt) {
        try {
            if (codeAtt == null) {
                return;
            }
            int increaseSizeBy = 4 / ReduceTheSizeOfLocalVariables.BLOCK_SIZE_IN_BYTES;
            int newMaxStack = codeAtt.getMaxStack().intValueUnsigned() * 
                    increaseSizeBy;
            codeAtt.setMaxStack(factory.createUn(newMaxStack).trim(2));
        } catch (Exception d) {
            d.printStackTrace();
            Miscellaneous.exit();
        }
    }
}
